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Python Pandas: Get index of rows which column matches certain value
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Simple way is to reset the index of the DataFrame prior to filtering:
df_reset = df.reset_index()
df_reset[df_reset['BoolCol']].index.tolist()
Bit hacky, but it's quick!
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How to make grep only match if the entire line matches?
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Simply specify the regexp anchors.
grep '^ABB\.log$' a.tmp
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How do you run a crontab in Cygwin on Windows?
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You need to also install cygrunsrv so you can set cron up as a windows service, then run cron-config.
If you want the cron jobs to send email of any output you'll also need to install either exim or ssmtp (before running cron-config.)
See /usr/share/doc/Cygwin/cron-*.R...
How do you debug a regex? [closed]
Regular expressions can become quite complex. The lack of white space makes them difficult to read. I can't step though a regular expression with a debugger. So how do experts debug complex regular expressions?
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What are some common uses for Python decorators? [closed]
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For nosetests, you can write a decorator that supplies a unit test function or method with several sets of parameters:
@parameters(
(2, 4, 6),
(5, 6, 11),
)
def test_add(a, b, expected):
assert a + b == expected
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How to use timeit module
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The way timeit works is to run setup code once and then make repeated calls to a series of statements. So, if you want to test sorting, some care is required so that one pass at an in-place sort doesn't affect the next pass with already sorted data (that,...
How to redirect 'print' output to a file using python?
... actions to a file.
A simple example
Import logging, get the logger, and set the processing level:
import logging
logger = logging.getLogger()
logger.setLevel(logging.DEBUG) # process everything, even if everything isn't printed
If you want to print to stdout:
ch = logging.StreamHandler()
ch.s...
How does the Windows Command Interpreter (CMD.EXE) parse scripts?
...ne or two value tokens that are identified.
The True command block is the set of commands after the condition, and is parsed like any other command block. If ELSE is to be used, then the True block must be parenthesized.
The optional False command block is the set of commands after ELSE. Again, thi...
What is the use of the %n format specifier in C?
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void authorizeUser( char * username, char * password){
...code here setting authorized to false...
printf(username);
if ( authorized ) {
giveControl(username);
}
}
where a malicious user could take advantage of the username parameter getting passed into printf as the f...
Using getopts to process long and short command line options
... ; exit 1 ; fi
# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"
VERBOSE=false
DEBUG=false
MEMORY=
DEBUGFILE=
JAVA_MISC_OPT=
while true; do
case "$1" in
-v | --verbose ) VERBOSE=true; shift ;;
-d | --debug ) DEBUG=true; shift ;;
-m | --memory ) MEMORY="$2"; sh...